diff --git a/tests/css_atrule/__snapshots__/jsfmt.spec.js.snap b/tests/css_atrule/__snapshots__/jsfmt.spec.js.snap
index d0a7faad7..f5e67edea 100644
--- a/tests/css_atrule/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/css_atrule/__snapshots__/jsfmt.spec.js.snap
@@ -59,3 +59,247 @@ url("http://example.com/foo/very/very/very/very/very/very/very/very/very/very/ve
 @namespace url("http://example.com/foo/very/very/very/very/very/very/very/very/very/very/very/very/very/very/very");
 
 `;
+
+exports[`supports.css 1`] = `
+@supports (transform-origin: 5% 5%) {}
+@supports (transform-origin:5% 5%) {}
+@supports ( transform-origin : 5% 5% ) {}
+@supports (  transform-origin  :  5%  5%  ) {}
+@supports
+    (transform-origin: 5% 5%) {}
+@supports
+(transform-origin: 5% 5%) {}
+@supports
+(
+transform-origin
+:
+5%
+5%
+) {}
+@supports (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+  (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+(
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop
+:
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value
+) {}
+@supports not(transform-origin: 10em 10em 10em) {}
+@supports not (transform-origin: 10em 10em 10em) {}
+@supports  not  ( transform-origin : 10em 10em 10em ) {}
+@supports   not   (  transform-origin  :  10em  10em  10em  ) {}
+@supports not
+  (transform-origin: 10em 10em 10em) {}
+@supports
+    not (transform-origin: 10em 10em 10em) {}
+@supports
+  not
+  (transform-origin: 10em 10em 10em) {}
+@supports
+not
+(
+transform-origin
+:
+10em
+10em
+10em
+) {}
+@supports not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+  not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports not
+  (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+not
+(
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop
+:
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value
+) {}
+@supports not (not (transform-origin: 2px)) {}
+@supports not(not(transform-origin:2px)) {}
+@supports not ( not ( transform-origin : 2px ) ) {}
+@supports  not  (  not  (  transform-origin  :  2px  )  ) {}
+@supports not
+  (not (transform-origin: 2px)) {}
+@supports not
+  (
+    not (transform-origin: 2px)
+  ) {}
+@supports
+not
+(
+not
+(
+transform-origin
+:
+2px
+)
+) {}
+@supports (display: flexbox) and (not (display: inline-grid)) {}
+@supports (display: table-cell) and (display: list-item) {}
+@supports ( display : table-cell ) and ( display : list-item ) {}
+@supports  (  display  :  table-cell  )  and  (  display  :  list-item  ) {}
+@supports
+  (display: table-cell) and (display: list-item) {}
+@supports (display: table-cell) and
+  (display: list-item) {}
+@supports (display: table-cell)
+  and (display: list-item) {}
+@supports
+(
+display
+:
+table-cell
+)
+and
+(
+display
+:
+list-item
+) {}
+@supports (display: table-cell) and (display: list-item) and (display: run-in) {}
+@supports (display: table-cell) and ((display: list-item) and (display: run-in)) {}
+@supports
+  (display: table-cell) and ((display: list-item) and (display: run-in)) {}
+@supports (display: table-cell)
+  and ((display: list-item)
+  and (display: run-in)) {}
+@supports (display: table-cell) and
+  ((display: list-item) and
+  (display: run-in)) {}
+@supports
+(
+display
+:
+table-cell
+)
+and
+(
+(
+display
+:
+list-item
+)
+and
+(
+display
+:
+run-in
+)
+) {}
+@supports (transform-style: preserve) or (-moz-transform-style: preserve) {}
+@supports (transform-style: preserve) or (-moz-transform-style: preserve) or (-o-transform-style: preserve) or (-webkit-transform-style: preserve) {}
+@supports (transform-style: preserve-3d) or ((-moz-transform-style: preserve-3d) or ((-o-transform-style: preserve-3d) or (-webkit-transform-style: preserve-3d))) {}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+@supports (transform-origin: 5% 5%) {
+}
+@supports (transform-origin: 5% 5%) {
+}
+@supports (transform-origin: 5% 5%) {
+}
+@supports (transform-origin: 5%  5%) {
+}
+@supports (transform-origin: 5% 5%) {
+}
+@supports (transform-origin: 5% 5%) {
+}
+@supports (transform-origin: 5%
+5%) {
+}
+@supports (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports not(transform-origin: 10em 10em 10em) {
+}
+@supports not (transform-origin: 10em 10em 10em) {
+}
+@supports not (transform-origin: 10em 10em 10em) {
+}
+@supports not (transform-origin: 10em  10em  10em) {
+}
+@supports not (transform-origin: 10em 10em 10em) {
+}
+@supports not (transform-origin: 10em 10em 10em) {
+}
+@supports not (transform-origin: 10em 10em 10em) {
+}
+@supports not (transform-origin: 10em
+10em
+10em) {
+}
+@supports not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {
+}
+@supports not (not (transform-origin: 2px)) {
+}
+@supports not(not(transform-origin:2px)) {
+}
+@supports not (not ( transform-origin: 2px )) {
+}
+@supports not (not ( transform-origin: 2px  )) {
+}
+@supports not (not (transform-origin: 2px)) {
+}
+@supports not (not (transform-origin: 2px)) {
+}
+@supports not (not
+(
+transform-origin: 2px
+)) {
+}
+@supports (display: flexbox) and (not (display: inline-grid)) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) {
+}
+@supports (display: table-cell) and (display: list-item) and (display: run-in) {
+}
+@supports (display: table-cell) and ((display: list-item) and (display: run-in)) {
+}
+@supports (display: table-cell) and ((display: list-item) and (display: run-in)) {
+}
+@supports (display: table-cell) and ((display: list-item)
+  and (display: run-in)) {
+}
+@supports (display: table-cell) and ((display: list-item) and
+  (display: run-in)) {
+}
+@supports (display: table-cell) and ((
+display: list-item
+)
+and
+(
+display
+:
+run-in
+)) {
+}
+@supports (transform-style: preserve) or (-moz-transform-style: preserve) {
+}
+@supports (transform-style: preserve) or (-moz-transform-style: preserve) or (-o-transform-style: preserve) or (-webkit-transform-style: preserve) {
+}
+@supports (transform-style: preserve-3d) or ((-moz-transform-style: preserve-3d) or ((-o-transform-style: preserve-3d) or (-webkit-transform-style: preserve-3d))) {
+}
+
+`;
diff --git a/tests/css_atrule/supports.css b/tests/css_atrule/supports.css
new file mode 100644
index 000000000..2c1b5dd53
--- /dev/null
+++ b/tests/css_atrule/supports.css
@@ -0,0 +1,131 @@
+@supports (transform-origin: 5% 5%) {}
+@supports (transform-origin:5% 5%) {}
+@supports ( transform-origin : 5% 5% ) {}
+@supports (  transform-origin  :  5%  5%  ) {}
+@supports
+    (transform-origin: 5% 5%) {}
+@supports
+(transform-origin: 5% 5%) {}
+@supports
+(
+transform-origin
+:
+5%
+5%
+) {}
+@supports (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+  (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+(
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop
+:
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value
+) {}
+@supports not(transform-origin: 10em 10em 10em) {}
+@supports not (transform-origin: 10em 10em 10em) {}
+@supports  not  ( transform-origin : 10em 10em 10em ) {}
+@supports   not   (  transform-origin  :  10em  10em  10em  ) {}
+@supports not
+  (transform-origin: 10em 10em 10em) {}
+@supports
+    not (transform-origin: 10em 10em 10em) {}
+@supports
+  not
+  (transform-origin: 10em 10em 10em) {}
+@supports
+not
+(
+transform-origin
+:
+10em
+10em
+10em
+) {}
+@supports not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+  not (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports not
+  (very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop: very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value) {}
+@supports
+not
+(
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-prop
+:
+very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-value
+) {}
+@supports not (not (transform-origin: 2px)) {}
+@supports not(not(transform-origin:2px)) {}
+@supports not ( not ( transform-origin : 2px ) ) {}
+@supports  not  (  not  (  transform-origin  :  2px  )  ) {}
+@supports not
+  (not (transform-origin: 2px)) {}
+@supports not
+  (
+    not (transform-origin: 2px)
+  ) {}
+@supports
+not
+(
+not
+(
+transform-origin
+:
+2px
+)
+) {}
+@supports (display: flexbox) and (not (display: inline-grid)) {}
+@supports (display: table-cell) and (display: list-item) {}
+@supports ( display : table-cell ) and ( display : list-item ) {}
+@supports  (  display  :  table-cell  )  and  (  display  :  list-item  ) {}
+@supports
+  (display: table-cell) and (display: list-item) {}
+@supports (display: table-cell) and
+  (display: list-item) {}
+@supports (display: table-cell)
+  and (display: list-item) {}
+@supports
+(
+display
+:
+table-cell
+)
+and
+(
+display
+:
+list-item
+) {}
+@supports (display: table-cell) and (display: list-item) and (display: run-in) {}
+@supports (display: table-cell) and ((display: list-item) and (display: run-in)) {}
+@supports
+  (display: table-cell) and ((display: list-item) and (display: run-in)) {}
+@supports (display: table-cell)
+  and ((display: list-item)
+  and (display: run-in)) {}
+@supports (display: table-cell) and
+  ((display: list-item) and
+  (display: run-in)) {}
+@supports
+(
+display
+:
+table-cell
+)
+and
+(
+(
+display
+:
+list-item
+)
+and
+(
+display
+:
+run-in
+)
+) {}
+@supports (transform-style: preserve) or (-moz-transform-style: preserve) {}
+@supports (transform-style: preserve) or (-moz-transform-style: preserve) or (-o-transform-style: preserve) or (-webkit-transform-style: preserve) {}
+@supports (transform-style: preserve-3d) or ((-moz-transform-style: preserve-3d) or ((-o-transform-style: preserve-3d) or (-webkit-transform-style: preserve-3d))) {}
diff --git a/tests/css_variables/__snapshots__/jsfmt.spec.js.snap b/tests/css_variables/__snapshots__/jsfmt.spec.js.snap
index 81df37f6e..92b54730b 100644
--- a/tests/css_variables/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/css_variables/__snapshots__/jsfmt.spec.js.snap
@@ -7,6 +7,12 @@ exports[`variables.css 1`] = `
     prop2: var(--my-var, --my-background, pink);
     prop3: calc(var(--prop) * 1px);
 }
+
+@supports (--foo: green) {
+    body {
+        color: var(--varName);
+    }
+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 .foo {
   --prop: 10px;
@@ -15,4 +21,10 @@ exports[`variables.css 1`] = `
   prop3: calc(var(--prop) * 1px);
 }
 
+@supports (--foo: green) {
+  body {
+    color: var(--varName);
+  }
+}
+
 `;
diff --git a/tests/css_variables/variables.css b/tests/css_variables/variables.css
index 6113caa18..ff6556f4f 100644
--- a/tests/css_variables/variables.css
+++ b/tests/css_variables/variables.css
@@ -4,3 +4,9 @@
     prop2: var(--my-var, --my-background, pink);
     prop3: calc(var(--prop) * 1px);
 }
+
+@supports (--foo: green) {
+    body {
+        color: var(--varName);
+    }
+}